1505. In planting in the picturesque style, great attention should be paid to the form and colour of the trees and shrubs employed. Some trees are very broad in proportion to their height, such as the oak, the Scotch elm, and the horse-chestnut; while others are tall and narrow, such as the larch and the spruce fir. Others again are of light foliage, such as the ash and the poplar. In ornamental planting advantage should be taken of these peculiarities, and also of peculiarities of colour in summer and autumn. Some trees are of a very dark green, almost black, such as the Irish yew; others are of a yellowish green, as the common laurel; others are of a bluish green, such as the bladder senna; some are tinged with brown, as the arbor vitï¾µ; and others white, such as the abele tree, or white poplar, and some kinds of willow. Others have the foliage tinged with red, as the scarlet maple and the Photinia; and others have purple leaves, such as the purple beech. Various other colours are found in foliage; and if they are studied carefully and mingled so as to produce a proper effect, the beauty of the plantation will be very greatly increased.